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4(r-5)+5(r-7)=-37
We simplify the equation to the form, which is simple to understand
4(r-5)+5(r-7)=-37
Reorder the terms in parentheses
+(+4r-20)+5*(r-7)=-37
Remove unnecessary parentheses
+4r-20+5+*(+r-7+)=-37
Reorder the terms in parentheses
+4r-20+(+5r-35)=-37
Remove unnecessary parentheses
+4r-20+5r-35=-37
We move all terms containing r to the left and all other terms to the right.
+4r+5r=-37+20+35
We simplify left and right side of the equation.
+9r=+18
We divide both sides of the equation by 9 to get r.
r=2
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